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Government Email Systems Vulnerable Due to DNS Typos

Government Email Systems Vulnerable Due to DNS Typos

First seen 5 Nov 2026, 23:45 UTC • •
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ThreatCluster AI
ThreatCluster •November 5, 2026 at 23:46 UTC
  • •43 government domains are exposed due to DNS record errors.
  • •Attackers can send emails impersonating government agencies.
  • •Livingston County authorized over 32,000 IP addresses for email, increasing risk.

A study by SH Consulting revealed that numerous US government domains are at risk due to typos in their DNS records. These errors allow attackers to impersonate government agencies by sending emails on their behalf. Specifically, 43 out of 25,964 scanned domains were found to reference expired or mistyped domains, with some already being exploited. For instance, Livingston County, Michigan, has authorized over 32,000 IP addresses to send emails, potentially allowing unauthorized access. The vulnerabilities stem from simple typographical errors, which can be difficult to detect. SH Consulting has taken steps to mitigate risks by defensively registering some of these domains and reporting findings to CISA and MS-ISAC. The situation underscores the importance of accurate DNS configurations for maintaining security in government email systems.

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Timeline

2026-11-05
Study reveals DNS vulnerabilities
SH Consulting published findings on DNS typos affecting US government domains, exposing them to impersonation risks.
Darkreading
2026-11-05
Defensive measures taken
SH Consulting registered 17 vulnerable domains and reported findings to CISA and MS-ISAC to mitigate risks.
www.sh.consulting

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Common questions

How many domains are affected?
The study identified 43 government-related domains with DNS record issues.
What are the risks of these DNS errors?
These errors can allow attackers to impersonate government agencies and send emails on their behalf.
What actions are being taken to address this?
SH Consulting has defensively registered some domains and reported the vulnerabilities to relevant authorities.